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1.
Braz. dent. j ; 34(2): 129-135, Mar.-Apr. 2023. tab, graf
Article in English | LILACS-Express | LILACS, BBO | ID: biblio-1439573

ABSTRACT

Abstract This study aimed to assess and correlate initial surface roughness and frictional resistance of rectangular CuNiTi wires inserted in different self-ligating brackets. The sample consisted of 40 bracket-wire sets (rectangular CuNiTi wires of 0.017" x 0.025" and passive self-ligating brackets) divided into four groups (n=10): metallic self-ligating bracket and metallic CuNiTi wire (G1); metallic self-ligating bracket and rhodium-coated CuNiTi wire (G2); esthetic self-ligating bracket and metallic wire (G3); esthetic self-ligating bracket and rhodium-coated CuNiTi wire (G4). The initial surface roughness of the wires was examined with a Surfcorder roughness meter, model SE1700. Later, frictional resistance was assessed in an Instron 4411 universal testing machine at a speed of 5 mm/min, in an aqueous medium at 35°C. Microscopic analyses of surface morphology were performed with scanning electron microscopy, using an LEO 1430, with magnifications of 1000X. Generalized linear models were applied, considering the 2 x 2 factorial (bracket type x wire type), at a 5% significance level. Regardless of bracket type, the groups with esthetic wires presented higher initial surface roughness than the groups with metallic wires (p<0.05). There was no significant difference between the different bracket-wire sets for frictional resistance and no significant correlation between frictional resistance and initial surface roughness in the environment studied. It is concluded that esthetic wires presented higher initial surface roughness but did not interfere with the frictional resistance between brackets and wires.


Resumo O objetivo deste estudo foi avaliar e correlacionar a rugosidade superficial inicial e a resistência a fricção dos fios CuNiTi retangulares inseridos em diferentes bráquetes autoligados. A amostra foi composta por 40 conjuntos bráquetes-fios (fios retangulares CuNiTi de 0.017" x 0.025" e braquetes autoligados passivos), divididos em 4 grupos (n=10): bráquete autoligado metálico e fio CuNiti metálico (G1); braquete autoligado metálico e fio CuNiti com revestimento de rhodium (G2); bráquete autoligado estético e fio metálico (G3); bráquete autoligado estético e fio CuNiti com revestimento de rhodium (G4). A rugosidade superficial inicial do fio foi examinada com um rugosímetro Surfcorder modelo SE1700. Posteriormente, a resistência a fricção foi avaliada em uma máquina de ensaios universal Instron 4411, a uma velocidade de 5mm/min em meio aquoso à 35oC. Análises microscópicas da morfologia de superfície foram realizadas por microscopia eletrônica de varredura, utilizando um LEO 1430, com ampliações de 1000X. Foram aplicados modelos lineares generalizados, considerando o fatorial 2 x 2 (tipo de bráquete x tipo de fio), com o nível de significância de 5%. Independentemente do tipo de bráquete, os grupos com fios estéticos apresentaram maior rugosidade superficial inicial que os grupos com fios metálicos (p<0,05). Não houve diferença significativa entre os diferentes conjuntos bráquetes-fios quanto a resistência à fricção e não houve correlação significativa entre a resistência a fricção e a rugosidade superficial inicial no ambiente estudado. Conclui-se que os fios estéticos apresentaram maior rugosidade superficial inicial porém não interferiram na resistência a fricção entre os braquetes e os fios.

2.
Article in English | LILACS, BBO | ID: biblio-1422287

ABSTRACT

Abstract Objective: To evaluate the psychosocial impact of malocclusion and self-esteem in adolescents in the Amazon region. Material and Methods: A cross-sectional study was carried out with 212 adolescents with 12-year-old enrolled in all public schools in the Boca do Acre (Amazonas, Brazil). Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) assessed the psychosocial impact of malocclusion. The self-perception of the need for orthodontic treatment was evaluated by the Aesthetic Component (AC) of the Index of Orthodontic Treatment Need (IOTN) and Global Negative Self-evaluation (GSE), the adolescent's self-esteem. The malocclusion was clinically evaluated by the Dental Aesthetic Index (DAI). The variables with p<0.20 in the individual analyses were tested in multiple logistic regression models, and those with p<0.10 remained in the model. The adjusted odds ratio (OR) was estimated with a 95% confidence interval (CI). Results: Adolescents with low self-esteem were 2.20 (95% CI: 1.23-3.93) times more likely to have a more significant impact on dental aesthetics (p<0.05). When verified by domains, the adolescents with low self-esteem had 2.33 (95% CI: 1.31-4.17) and 1.93 (95% CI: 1.09-3.42) times more likely to impact the psychological and social domains of the PIDAQ, respectively. Conclusion: Self-esteem influenced adolescents' perception of dental aesthetics in the domains related to psychological and social impact (AU).


Subject(s)
Humans , Male , Female , Adolescent , Self Concept , Adolescent , Psychosocial Impact , Index of Orthodontic Treatment Need , Malocclusion/diagnosis , Social Perception , Logistic Models , Cross-Sectional Studies/methods , Multivariate Analysis , Surveys and Questionnaires
3.
Rev. odontol. UNESP (Online) ; 50: e20210018, 2021. tab
Article in English | LILACS, BBO | ID: biblio-1341587

ABSTRACT

Abstract Introduction Orofacial pain is a critical TMD symptom that can influence physical and social capacity. Objective To evaluate the association of temporomandibular disorders (TMD) symptoms with affective relationships and demographic variables in young adults. Material and method A cross-sectional study involving 395 young adults was developed. Diagnostic Criteria for TMD, anxiety, and depression were collected from questionnaires. The Dental Health Component of the Index of Orthodontic Treatment Need measures the orthodontic treatment need. Questionnaires also contained questions related to the previous orthodontic treatment. Logistic regression models were adjusted, estimating crude odds ratio with the 95% confidence intervals. The variables with p<0.20 in the analyses were assessed in a multiple logistic regression model, remaining with p≤0.10. Result There was no significant association of TMD symptoms with sex, age, medication use for pain, previous orthodontic treatment, orthodontic treatment need, anxiety, and depression (p>0.05). Individuals without an affective relationship are 1.78 (95%CI: 0.99-3.17) times more likely to report TMD symptoms. Conclusion Affective relationships showed an association with TMD symptoms in young adults.


Resumo Introdução A dor orofacial é um sintoma crítico da DTM que pode influenciar a capacidade física e social. Objetivo Avaliar a associação dos sintomas das desordens têmporomandibulares (DTM) com as relações afetivas e variáveis demográficas em adultos jovens. Material e método Estudo transversal envolvendo 395 adultos jovens foi realizado. Os critérios diagnósticos para DTM, ansiedade e depressão foram coletados a partir de questionários. O Componente de Saúde Bucal do Índice de Necessidade de Tratamento Ortodôntico mensurou a necessidade de tratamento ortodôntico. Os questionários também continham questões relacionadas ao tratamento ortodôntico anterior. Modelos de regressão logística foram ajustados, estimando odds ratio bruto com os intervalos de confiança de 95%. As variáveis com p<0.20 nas análises foram avaliadas em modelo de regressão logística múltipla, permanecendo as variáveis com p≤0.10. Resultado Não houve associação significativa dos sintomas de DTM com sexo, idade, uso de medicamentos para dor, tratamento ortodôntico prévio, necessidade de tratamento ortodôntico, ansiedade e depressão (p>0.05). Indivíduos sem relacionamento afetivo têm 1.78 (IC95%:0.99-3.17) vezes mais chance de relatar sintomas de DTM. Conclusão Os relacionamentos afetivos mostraram associação com os sintomas de DTM em adultos jovens.


Subject(s)
Humans , Male , Female , Adult , Temporomandibular Joint Disorders/prevention & control , Affective Symptoms , Young Adult , Anxiety , Facial Pain , Logistic Models , Demography , Oral Health , Cross-Sectional Studies , Surveys and Questionnaires , Depression , Index of Orthodontic Treatment Need , Malocclusion
4.
Rev. odontol. UNESP (Online) ; 48: e20190066, 2019. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1043175

ABSTRACT

Abstract Introduction This cross-sectional study aimed to associate the normative cephalometric results of mandibular retrognathism treatment with patient perception on the esthetic improvement of facial profile. Objective this cross-sectional study aimed to associate the normative cephalometric results of mandibular retrognathism treatment with patient perception on the esthetic improvement of facial profile. Material and method The normative cephalometric results were obtained from lateral cephalometric radiographs of a sample of 24 Class II malocclusion patients in the pubertal growth spurt. Such patients were treated with a mandibular advancement device and evaluated by comparing pre- and post-treatment variables. The same radiographs were used to produce standardized black silhouettes that were randomly arranged. Patients were instructed to choose their preferred profile and indicate the changes perceived using a 7-point Likert scale. The data were compared with cephalometric results using a mixed-model methodology for time-repeated measures, Student's t-test, and t-test for heterogeneous variances, at 5% significance level. Result A rate of 75% of patients preferred post-treatment silhouettes and changes were perceived regardless of the choice of either pre- or post-treatment profile. There was no significant difference between the cephalometric variables of the tracings that produced the silhouettes considered better or worse after the evaluation. Conclusion There was no association between the cephalometric results after treatment and the perception of esthetic improvement by patients treated for mandibular retrognathia.


Resumo Introdução Este estudo transversal buscou associar resultados cefalométricos normativos do tratamento do retrognatismo mandibular com melhora estética do perfil facial na percepção do paciente. Objetivo este estudo transversal buscou associar resultados cefalométricos normativos do tratamento do retrognatismo mandibular com melhora estética do perfil facial na percepção do paciente. Material e método Os resultados cefalométricos normativos obtidos em radiografias cefalométricas laterais de uma amostra de 24 pacientes com maloclusão de Classe II em fase de crescimento tratados com aparelho de avanço mandibular, foram avaliados comparando-se as grandezas pré e pós-tratamento. As mesmas radiografias foram utilizadas para gerar silhuetas negras padronizadas que foram dispostas aleatoriamente. Os pacientes foram instruídos a escolher seu perfil preferido e indicar quanta mudança foi percebida por meio de uma escala de Likert de 7 pontos. Os dados foram comparados com resultados cefalométricos aplicando-se metodologia de modelos mistos para medidas repetidas no tempo, teste t de student e teste t para variâncias heterogêneas, com nível de significância de 5%. Resultado 75% dos pacientes escolheram silhuetas pós-tratamento e a mudança foi percebida independentemente da escolha por pré ou pós-tratamento. Não houve diferença significativa entre as variáveis ​​cefalométricas dos traçados que deram origem às silhuetas consideradas melhores e piores após a avaliação. Conclusão Não houve associação entre os resultados cefalométricos pós-tratamento e a percepção da melhora estética por pacientes ortodônticos.


Subject(s)
Humans , Male , Female , Child , Adolescent , Retrognathia , Cephalometry/methods , Malocclusion, Angle Class II , Orthodontic Appliances , Cross-Sectional Studies , Esthetics
5.
Braz. j. oral sci ; 15(2): 137-143, Apr.-June 2016. ilus
Article in English | LILACS, BBO | ID: biblio-848250

ABSTRACT

Aim: To evaluate signs and symptoms of temporomandibular joint disorder and satisfaction in patients before and after orthognathic surgery. Methods: The sample consisted of 15 patients aged between 19 and 47 years old, indicated for orthodontic-surgical treatment. All patients answered na anamnesis questionnaire based on Helkimo Anamnestic Index to evaluate subjective symptoms and underwent a clinical evaluation based on Helkimo Disfunction Index, applied at three time points: before (T0), three (T1) and six months (T2) after surgery. Statistical models used were χ2 test (Chi-square), Tukey test, confidence interval and analysis of variance (ANOVA). Results: Statistical analysis revealed no significant difference in the incidence of joint sounds, maximum mouth opening, deviation of mouth opening and pain in the TMJ region (p>0.05). No patient presented worsening of the symptomatology. As regards muscular pain, there was a statistically significant improvement with time (p<0.05) and 86.7% of patients reported that they were satisfied with the obtained results. Conclusions: Improvement of TMD after orthognathic surgery may not be the result of correcting malocclusion and satisfaction with the results can be a factor of TMD improvement (Au)


Subject(s)
Humans , Male , Female , Dentofacial Deformities/diagnosis , Malocclusion/diagnosis , Orthognathic Surgery , Osteotomy, Le Fort , Osteotomy, Sagittal Split Ramus , Patient Satisfaction , Self Concept , Temporomandibular Joint Disorders/diagnosis , Medical History Taking , Orthodontics , Surveys and Questionnaires
6.
RGO (Porto Alegre) ; 64(2): 164-170, Apr.-June 2016. tab
Article in English | LILACS | ID: lil-789119

ABSTRACT

ABSTRACT Objective The aim of the study was to determine prevalence of malocclusion and the inter- and intra-arch relations in schoolchildren of 7-12 years of Vazante, Minas Gerais, Brazil. Methods In the inter-arch relations the sagittal, vertical and transverse aspects were evaluated, and in the intra-arch relations, diastemas, crowding and tooth losses were determined in 670 children. The maloclussion was classified as Class I , II and III according to Angle, based on the position of the first molars. For this study, the sample was divided into two age groups: children from 7 to 9 years and children from 10 to 12 years old. Results A similar percentage of individuals with Class I and II was found in the two age groups evaluated. A higher percentage of Class III individuals was observed in the age group from 10 to 12 years. The presence of cross bite, anterior open bite, diastemas, crowding and early primary tooth loss was prevalent in the age groups of 7 and 9 years. Deep bite, posterior cross bite and early loss of permanent teeth prevailed in the age from 10 to 12 years. Conclusion It could be concluded that there was a high rate of malocclusion in children and the sagittal relation was maintained in the two periods evaluated. A larger number of manifestations of anterior open bite were observed in the age group of 7 to 9 years, and overbite in the Group from 10 to 12 years. In the transverse relation there was an increase in cross bite from the first to second transitory period.


RESUMO Objetivo Determinar a prevalência de má oclusão e as relações inter e intra-arco em escolares de 7 a 12 anos de Vazante, Minas Gerais, Brasil. Métodos Nas relações inter-arco os aspectos no plano sagital, verticais e transversais foram avaliados e, no intra-arco, as relações de diastemas, apinhamento e perdas dentárias foram determinadas em 670 escolares. A má oclusão foi classificada em classe I, II e III de acordo com Angle, baseada na posição dos primeiros molares. Para este estudo, a amostra foi dividida em dois grupos etários: crianças 7-9 anos e crianças dos 10 aos 12 anos de idade. Resultados Uma percentagem semelhante de indivíduos com má oclusão de Classe I e II foi encontrado nos dois grupos etários avaliados. A maior percentagem de indivíduos com má oclusão de Classe III foi observada na faixa etária dos 10 aos 12 anos. A presença de mordida cruzada, mordida aberta anterior, diastemas, apinhamento e perda dentária precoce primária foi prevalente nas faixas etárias de 7 e 9 anos. Sobremordida profunda, mordida cruzada posterior e perda precoce dos dentes permanentes prevaleceram na faixa etária de 10-12 anos. Conclusão Pode-se concluir que houve uma alta taxa de má oclusão em crianças e a relação sagital foi mantido nos dois períodos avaliados. Foi observado um maior número de mordida aberta anterior na faixa etária de 7 a 9 anos, e sobremordida profunda no grupo dos 10 aos 12 anos. Na relação transversal, houve um aumento da mordida cruzada do primeiro para o segundo período de transição.

7.
CoDAS ; 28(2): 155-162, mar.-abr. 2016. graf
Article in Portuguese | LILACS | ID: lil-782144

ABSTRACT

RESUMO Objetivo O principal objetivo deste estudo foi investigar o efeito do tempo de contração e repouso na atividade dos músculos masseter e temporal. Métodos 49 sujeitos do sexo feminino com idade entre 18 e 30 anos foram divididos em grupos DTM (n: 26) e controle (n: 23). A eletromiografia de superfície foi utilizada para avaliar os músculos temporal anterior e masseter durante protocolos de contração e repouso muscular. Foram analisados os parâmetros eletromiográfico raiz quadrada da média, frequência mediana e o coeficiente da inclinação da reta de regressão linear. Resultados Foi encontrado efeito significativo do tempo no protocolo de contração e de repouso muscular. No protocolo de contração, sujeitos com DTM apresentaram significativa diminuição da frequência mediana no masseter direito e do coeficiente de inclinação do músculo temporal direito comparados ao grupo controle. Conclusão Apesar de os sujeitos com DTM apresentarem maior suscetibilidade à fadiga, comparados aos controles, ambos os grupos devem respeitar o tempo máximo de 5 s de contração voluntária máxima e no mínimo 30 s de repouso entre sucessivas contrações da musculatura mastigatória durante protocolos de avaliação clínica ou de pesquisa.


ABSTRACT Purpose The main objective of this study was to investigate the effect of time of contraction and rest on the masseter and temporal muscles activity. Methods 49 female subjects between 18 and 30 years of age were divided into TMD (n: 26) and control groups (n: 23). Surface electromyograph was used to evaluate the anterior temporal and masseter muscles during contraction and rest protocols. The root means square, median frequency and slope coefficient of the linear regression line parameters were analyzed. Results A significant effect of time in the contraction and rest muscle protocols was found. TMD patients showed a significant decrease in median frequency in the right masseter muscle and the slope coefficient in the right temporal muscle during the contraction protocol to control subjects. Conclusion Despite the TMD patients presented with higher fatigue susceptibility compared to the control group, both groups must meet the maximum time of 5 s of maximum voluntary contraction and at least 30 s rest between successive contractions of masticatory muscles during clinical or research assessment protocols.


Subject(s)
Humans , Female , Adolescent , Adult , Young Adult , Temporal Muscle/physiopathology , Temporomandibular Joint Disorders/physiopathology , Masseter Muscle/physiopathology , Muscle Contraction/physiology , Muscle Relaxation/physiology , Reference Values , Time Factors , Case-Control Studies , Cross-Sectional Studies , Analysis of Variance , Statistics, Nonparametric , Muscle Fatigue/physiology , Electromyography , Mastication/physiology
8.
Ortodontia ; 47(6): 539-543, nov.-dez. 2014. tab
Article in Portuguese | LILACS, BBO | ID: lil-760097

ABSTRACT

O objetivo deste estudo foi avaliar a concordância de diagnóstico considerando a classificação de perfis faciais, realizada por dentistas em diferentes níveis de programas de pós-graduação em Ortodontia. Um total de 30 fotografias digitais da face, em norma frontal e lateral, foi utilizado no estudo. As fotografias foram analisadas por três ortodontistas calibrados que, baseados em características morfológicas, classificaram os perfis faciais nos seguintes padrões: I, II, III, face curta e face longa, de acordo com Capelozza (2004). Com o objetivo de verificar a influência do nível educacional na taxa de concordância de diagnóstico facial das 30 fotografias, 15 foram randomicamente selecionadas e submetidas à análise. Os três diferentes níveis avaliados de dentistas de programas de pós-graduação em Ortodontia foram: atualização; especialização e mestrado. Os dados foram submetidos à análise do coeficiente kappa e qui-quadrado (a=0,05). Não houve diferença estatística entre a concordância alcançada pelos diferentes grupos em comparação ao padrão-ouro (p=0,8441). Contudo, interessantemente, houve maior concordância no grupo de especialização (K=0,362 e p-valor < 0,001). Mesmo com as limitações inerentes a este tipo de análise, concluiu-se que os profissionais dos diferentes níveis de aprendizado determinaram diagnósticos semelhantes em relação ao mesmo paciente, e que os especialistas apresentam maior concordância no diagnóstico.


The aim of this study was to evaluate the diagnosis concordance regarding the classification of facial profiles realized by dentists in the different levels of post-graduation Orthodontic courses. A total of 30 digital photographs of the face, in frontal and lateral views, were used in this study. The photographs were analyzed for 3 calibrated orthodontists who, based on morphological characteristics presented in the images, classified the facial profiles in the following patterns: I, II, III, short-face and long-face, according Capelozza (2004). In order to verify the influence of educational level on the agreement rate regarding facial diagnosis, from the 30 photographs, 15 were randomly selected and subjected to analysis. The different evaluated degree levels of dentists under post-graduation programs in Orthodontic were: training, specialization and mastering. Data were subjected to kappa coefficient and chi square analysis (a=0.05). There was no statistical differences in the agreement achieved by the different groups in comparison with the gold standard (p=0.8441). However, interestingly, there was a higher accordance in the specialization group (K=0.362 e p < 0.001). Within the limitations inherent to this type of analyse, we conclude that the professionals in the different levels of degree determined similar diagnostics regarding a singular patient. Moreover, the specialization group presented higher concordance in the diagnosis.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Diagnosis , Face , Orthodontics , Photography, Dental
9.
CoDAS ; 26(5): 389-394, 2014. tab
Article in English | LILACS | ID: lil-727066

ABSTRACT

Purpose: This study aimed to establish the prevalence of pain in the craniomandibular and cervical spine region in individuals with Temporomandibular Disorders (TMD) and to analyze the effects of these disorders on the bilateral activation of anterior temporalis (AT) and masseter (MA) muscles during the masticatory cycle. Methods: The participants were 55 female volunteers aged 18–30 years. The presence of TMD and craniomandibular and cervical spine pain was evaluated by applying the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) questionnaire and using a combination of tests for the cervical region. The muscle activity of AT and MA during the masticatory cycle was assessed using the symmetry and antero-posterior coefficient indices. Results: The AT activity during the masticatory cycle is more asymmetric in individuals with TMD. The craniomandibular pain, more prevalent in these individuals, influenced these results. Conclusion: Individuals with TMD showed changes in the pattern activity of AT. The craniomandibular nociceptive inputs can influence the increase in asymmetry of the activation of this muscle. .


Objetivo: O objetivo deste estudo foi determinar a prevalência de dor nas regiões craniomandibular e cervical em indivíduos com Disfunção Temporomandibular (DTM) e analisar o efeito dessas desordens na ativação bilateral dos músculos temporal anterior (TA) e masseter (MA) durante o ciclo mastigatório. Métodos: Participaram deste estudo 55 voluntários do sexo feminino com idade de 18 a 30 anos. A presença de DTM e de dor craniomandibular e cervical foi avaliada por meio do questionário Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) e uma combinação de testes para a região cervical. A análise da ativação muscular do TA e MA durante o ciclo mastigatório foi realizada através dos índices de simetria e do coeficiente anteroposterior. Resultados: A atividade dos músculos TA, durante o ciclo mastigatório, é mais assimétrica em indivíduos com DTM. A dor craniomandibular, mais prevalente nesses indivíduos, influencia nesses resultados. Conclusão: Indivíduos com DTM apresentam alteração no padrão mastigatório do músculo TA e estímulos nociceptivos da região craniomandibular podem influenciar no aumento da assimetria de ativação dessa musculatura. .


Subject(s)
Adolescent , Adult , Female , Humans , Young Adult , Craniomandibular Disorders/etiology , Musculoskeletal Pain , Masseter Muscle/physiopathology , Neck Pain/etiology , Temporal Muscle/physiopathology , Temporomandibular Joint Disorders/complications , Craniomandibular Disorders/physiopathology , Electromyography , Mastication , Neck Pain/physiopathology , Pain Measurement , Surveys and Questionnaires , Temporomandibular Joint Disorders/physiopathology
10.
Dental press j. orthod. (Impr.) ; 19(5): 74-78, Sep-Oct/2014. tab, graf
Article in English | LILACS | ID: lil-727103

ABSTRACT

OBJECTIVE: By means of a photoelastic model, this study analyzed the stress caused on conventional and self-ligating brackets with expanded arch wires. METHOD: Standard brackets were adhered to artificial teeth and a photoelastic model was prepared using the Interlandi 19/12 diagram as base. Successive activations were made with 0.014-in and 0.018-in rounded cross section Nickel-Titanium wires (NiTi) and 0.019 x 0.025-in rectangular stainless steel wires all of which made on 22/14 Interlandi diagram. The model was observed on a plane polariscope - in a dark field microscope configuration - and photographed at each exchange of wire. Then, they were replaced by self-ligating brackets and the process was repeated. Analysis was qualitative and observed stress location and pattern on both models analyzed. CONCLUSIONS: Results identified greater stress on the region of the apex of premolars in both analyzed models. Upon comparing the stress between models, a greater amount of stress was found in the model with conventional brackets in all of its wires. Therefore, the present pilot study revealed that alignment of wires in self-ligating brackets produced lower stress in periodontal tissues in expansive mechanics. .


OBJETIVO: o presente estudo analisou, por meio de um modelo fotoelástico, a distribuição das tensões geradas em braquetes convencionais e autoligáveis quando ativados com arcos expandidos. MÉTODOS: braquetes convencionais foram colados em dentes artificiais e, em seguida, foi confeccionado o modelo fotoelástico, utilizando como base o diagrama 19/12, de Interlandi. Foram feitas trocas sucessivas com fios de liga de níquel-titânio (NiTi) de secção circular 0,014" e 0,018" e de liga de aço de secção retangular 0,019" x 0,025", todos no diagrama 22/14 de Interlandi. A cada troca de fio, o modelo foi observado em polariscópio plano, na configuração de campo escuro, e fotografado. Foi feita a substituição por braquetes autoligáveis e repetido o experimento. A análise foi qualitativa, observando o local e o padrão da tensão das franjas nos dois modelos analisados. CONCLUSÕES: os resultados identificaram uma maior padrão de tensões das franjas na região do ápice de pré-molares em ambos os modelos analisados. Ao se comparar as tensões entre os modelos, observou-se uma maior quantidade de tensão nas franjas no modelo com braquetes convencionais em todos os fios utilizados no experimento. Portanto, o presente estudo mostrou que o alinhamento dos fios nos braquetes autoligáveis produz forças mais suaves nos tecidos periodontais nas mecânicas expansionistas. .


Subject(s)
Humans , Orthodontic Appliance Design , Orthodontic Wires , Orthodontic Brackets/classification , Biomechanical Phenomena , Dental Alloys/chemistry , Mandible , Materials Testing , Models, Anatomic , Nickel/chemistry , Pilot Projects , Photography/methods , Stainless Steel , Stress, Mechanical , Surface Properties , Titanium/chemistry , Tooth Apex/physiology , Tooth Root/physiology
11.
Ortodontia ; 47(3): 233-237, maio.-jun.2014. tab
Article in Portuguese | LILACS | ID: lil-760049

ABSTRACT

Avaliar a correlação entre mordida cruzada posterior e a melhora na postura global nos planos frontal, lateral e dorsal após disjunção palatina. Métodos: a amostra foi composta por dez crianças com idades entre seis e 13 anos, de ambos os gêneros, que apresentavam mordida cruzada posterior funcional. As crianças foram tratadas ortodonticamente por meio de disjunção palatina utilizando aparelho do tipo Hyrax. A avaliação postural global dos indivíduos foi feita por meio da análise comparativa de imagens fotográficas, realizadas com auxílio de simetrógrafo para observação dos planos: frontal (plano biacromial, cristas ilíacas e birotular); lateral (anteriorização e posteriorização de cabeça) e dorsal (plano biescapular, pregas glúteas e bimaleolar). Ao término do tratamento ortodôntico a postura global foi reavaliada. Resultados: os dados coletados foram submetidos a teste estatístico de Wilcoxon, com índice de significância de 0,05%. Os resultados obtidos pós-tratamento para o plano frontal indicaram que não houve alteração postural na articular biacromial (p=1,00); para o parâmetro articular cristas ilíacas observou-se melhora postural (p=0,016); no parâmetro birotular não houve melhora de simetria nessa articulação (p=1,00). No plano lateral não se obteve melhora na anteriorização de cabeça (p=0,125). No plano dorsal, no parâmetro articular biescapular não houve melhora na simetria desse plano (p=0,25); no parâmetro articular cristas ilíacas houve melhora na simetria dessa articulação (p=0,016); no parâmetro articular bimaleolar não houve melhora de postura nessa articulação (p=0,109). Conclusão: houve melhora postural após tratamento da mordida cruzada posterior por meio de disjunção palatina, para os planos frontal e dorsal no parâmetro cristas ilíacas...


To evaluate correlation between posterior crossbite and improvement in overall posture plans front, side and dorsal after palatal disjunction with the Hyrax appliance. Methods: ten children aged six to thirteen years, both genders, that presented crossbite functional were evaluated. All patients underwent orthodontic treatment by means of disjunction palate using Hyrax appliance. Postural assessment of global subjects was performed by comparative analysis of images using symmetrograph to observ front plans (biacromial plan, iliac crests and birotular); side (anterior and a posterior head) and dorsal (biescapular, folds gluteal and bimalleolar). Wilcoxon statistical test was using with a significance level of 0.05%. Results: the results obtained after treatment for frontal plane showed no postural changes in articular biacromial (p=1.00), for the parameter joint iliac crests obtained an improvement in posture (p=0.016). In parameter birotular were not improved symmetry in this joint (p=1.00). There were no improvement in forward head (p=0.125). On the dorsal plan, the joint parameter biescapular there was no improvement in the symmetry of the plan (p=0.25), the parameter articular iliac crests improvement in the symmetry of this joint (p=0.016), the joint parameter bimalleolar were not improved posture this joint (p=0.109). Conclusion: there was postural improvement after treatment of posterior cross bite using palatal expansion in front and dorsal plans in joint iliac crests parameter...


Subject(s)
Humans , Male , Female , Child , Facial Asymmetry , Joints , Malocclusion , Posture , Palatal Expansion Technique/adverse effects , Palatal Expansion Technique
12.
Braz. j. oral sci ; 13(2): 93-97, Apr-Jun/2014. tab, graf
Article in English | LILACS | ID: lil-715606

ABSTRACT

AIM: To evaluate changes in pharyngeal airway space (nasopharynx and oropharynx), soft palate and lingual vallecula after maxillary advancement surgery and maxillary advancement and mandibular setback surgery (bimaxillary surgery). METHODS: Twenty Class III adult patients were included in the study. Ten patients were treated with maxillary advancement and ten with bimaxillary surgery (maxillary advancement and mandibular setback). Cephalometric landmark measurements were recorded at 3 different time intervals: pre-surgical, post-surgical and six months after surgery. Data collected were subjected to one-way ANOVA (p<0.05). RESULTS: Nasopharyngeal airway space increased after maxillary advancement and decreased after bimaxillary surgery. There was increase in oropharyngeal dimensions in the region around the uvula and loss of space for lingual vallecula, while in Group 2 there was diminished space for both uvula and vallecula. The uvula and vallecula were moved forward in Group 1, whereas these structures were moved in the posterior direction in Group 2. CONCLUSIONS: After maxillary advancement surgery there was an increased in space in the nasopharyngeal region. The oropharyngeal region related to the uvula presented an increase in space, whereas there was a reduction in relation to the lingual vallecula. The uvula and lingual vallecula were moved forward. Bimaxillary surgery promoted a reduction in the nasopharyngeal and oropharyngeal regions as regards both the uvula and lingual vallecula. The uvula and lingual vallecula were moved in the posterior direction...


Subject(s)
Humans , Male , Female , Orthognathic Surgery , Palate, Soft , Pharynx
13.
Ortodontia ; 46(6): 575-578, nov.-dez. 2013. tab
Article in Portuguese | LILACS, BBO | ID: lil-714234

ABSTRACT

O objetivo neste estudo foi avaliar a influência do clareamentodentário sobre a resistência da união de braquetes ortodônticos decerâmica ao esmalte. Os dentes foram aleatoriamente separados emtrês grupos (n=20), sendo: Grupo 1(controle): os dentes não receberamnenhum tipo de agente clareador; Grupo 2: os dentes foram clareados ea colagem realizada 24 horas após o término do clareamento; Grupo 3:os dentes foram clareados e a colagem foi realizada sete dias apóso término do clareamento. Para o clareamento dentário dos Grupos 2e 3, foi utilizado o gel clareador Whitness HP Blue com cálcio a 35%- peróxido de hidrogênio 35%. Utilizou-se o agente clareador após aaplicação do dessensibilizante Dessensibilize a 2% KF,que foi mantidopor dez minutos. Para a colagem, os dentes foram condicionados porácido fosfórico 37% e fixados com o sistema adesivo Transbond XT.Foram utilizados braquetes de cerâmica fotoativados por 40 segundos.Após 24 horas, os corpos-de-prova foram submetidos ao teste decisalhamento com velocidade de compressão de 1 mmjminuto. Osdados foram submetidos à análise de Kruskal-Wallis e ao teste de Tukey(p < 0,05). Houve diferença significativa entre o grupo controle e ogrupo clareado e colado após 24 horas (p < 0,05), entretanto, o grupocolado após sete dias não diferiu significativamente dos demais grupos(p > 0,05). O índice de remanescente adesivo mostrou predominânciade escore 3, em que toda resina permaneceu aderida ao dente. Portanto,concluiu-se que após o clareamento dentário é indicado esperar,no mínimo, sete dias para a colagem dos braquetes ortodônticos.


The aim in this study as to evaluate the influence of dentalbleaching on the bond strength of ceramic brackets to enamel. The teethwere separated in three groups (n=20). Group 1 (control group): theteeth did not receive any bleaching agent; Group 2: the brackets werebonded 24 hours after dental bleaching; Group 3: the brackets werebonded seven days after dental bleaching. For the dental bleaching ofgroups 2 and 3 it was used Whitness HP Blue 35% with calcium (35%hydrogen peroxide). The bleaching agent was used after the applicationof the Desensitizer 2% KF, which was kept for ten minutes. For thebracket bonding, the teeth were conditioned by 37% phosphoric acidand fixed with the adhesive system Transbond XT. Ceramic bracketswere light activated for 40 seconds. After 24 hours the specimens weresubmitted to the shear bond strength test with a compression speedof 1 mmjminute. The data was submitted to the Kruskal-Wallis analysisand the Tukey test (p < 0.05). There was significant difference betweenthe control group and the group bleached and bonded after 24 hours(p < 0.05). However, the group bonded after seven days did not differsignificantly from the other groups (p > 0.05). The adhesive remnantindex showed a predominance of score 3, in which ali resin remainedattached to the tooth. Therefore, it is recommended to wait at leastseven days before bonding orthodontic brackets.


Subject(s)
Tooth Bleaching/adverse effects , Hydrogen Peroxide , Orthodontic Brackets , Shear Strength , Dental Bonding , Dental Cements , Phosphoric Acids
14.
Braz. j. oral sci ; 12(1): 41-45, jan.-mar. 2013. ilus, tab
Article in English | LILACS, BBO | ID: lil-671931

ABSTRACT

Aim: To evaluate the frictional force between the archwire and orthodontic bracket generated by elastomeric ligatures with polymer coating (Super slick, TP Orthodontics) and conventional ligatures (Morelli) using two types of insertion techniques. Methods: Forty elastomeric ligatures, 20 with polymer coating and 20 conventional, were evaluated. Each type of ligature was separated into two groups (n=10), according to the insertion mode: conventional or crossed (from mesial to distal region crossed in front). To analyze friction, 40 5-cm-long segments of stainless steel orthodontic archwire 0.019" x 0.025" (Morelli) and Edgewise brackets (slot 0.022" x 0.028"; Morelli) were used. Each set (bracket, wire and elastic) was submitted to frictional testing in a universal test machine (Instron 4411) at a crosshead speed of 5 mm/min. Each bracket was moved 5 mm on the wire, with maximum friction and mean friction being recorded by software. Three readouts were taken for each bracket. Data were submitted to two-way ANOVA and Tukey’s test (p<0.05). Results: It was shown that for maximum and mean friction, the polymer-coated ligature did not differ statistically from the conventional type in a dry environment condition. Ligatures placed incrossed mode promoted significantly greater friction than those placed in conventional mode, irrespective of the type of elastomeric ligature. Conclusions: Friction depended on the insertion mode, but not on the type of elastomeric ligature.


Subject(s)
Elastomers , Friction , Orthodontics/instrumentation
15.
In. Cunha, Ângel Cristina Pinto de Paiva; Santos-Coluchi, Giselle Gasparino dos; Souza, Lourdes Bernadete Rocha de. Ortodontia e fonoaudiologia na prática clínica. Rio de Janeiro, Revinter, 20110000. p.67-80, ilus, graf. (BR).
Monography in Portuguese | LILACS, BBO | ID: biblio-872063
16.
Odontol. clín.-cient ; 11(2): 117-119, Abr.-Jun. 2012. tab
Article in Portuguese | LILACS | ID: lil-699758

ABSTRACT

Diante do aumento da prevalência de fissurados na região sudeste, este estudo buscou identificar, dentre os nascidos vivos da cidade de Rio Claro - SP, esse aumento. Foi realizada uma investigação nos prontuários pertencentes à Vigilância Sanitária da cidade de Rio Claro-SP, no período de janeiro a novembro de 2006 a 2009, com a finalidade de verificar, dentre o número total de recém-nascidos vivos, a porcentagem de recém-nascidos com a presença de fissuras. Em 9129 prontuários de pacientes nascidos na região de Rio Claro - SP, foi verificada a ocorrência de fissura labial ou palatina, relacionada com o sexo. Os dados obtidos foram submetidos a uma estatística descritiva. Diante dos resultados, foi possível concluir que o registro da prevalência de pacientes fissurados na região sudeste do Brasil tem aumentado e que as fendas labiais foram mais prevalentes no sexo masculino e as palatinas no feminino.


Given the increased prevalence of cleft in the Southeast, this study intent to identify, among the living babies that were born in Rio Claro - S.P, the assurance of this prevalence. An investigation in the precedent handbooks from the Health Surveillance in Rio Claro - S.P, since January 2006 until November 2009, comes to verify the percentage of living new-born that presents with cleft. Occurrences of lip and palate clefts and sex were confirmed in 9129 handbooks from patients born in Rio Claro. The data obtained were submitted to a descriptive statistic. It was possible to conclude by the results that record of the prevalence of cleft patients in the Southeast region of Brazil has increased and lip clefts are more predominant in male and palate clefts in female people.

17.
Braz. j. oral sci ; 10(3): 167-170, Jul.-Sep. 2011. ilus, tab
Article in English | LILACS, BBO | ID: lil-725235

ABSTRACT

Aim: The purpose in this study was to evaluate the degradation force of conventional synthetic orthodontic elastics and synthetic orthodontic elastics with memory properties. Methods: Specimens of each material (Plastic chain, Memory chain and Closed spring NiTi) were stretched and adapted to the test specimens composed of resin plates and orthodontic wires, simulating retraction units. Degradation force was verified in an Instron universal test machine at the following intervals: 1, 2, 18, 24, 48 h; 7, 14, 21, and 28 days. Data (gF) were analyzed statistically using Friedman and Kruskal-Wallis tests at 5% significance level. Results: It was observed a significant force reduction of Plastic chain and Memory chain after 2 h (p<0.05). For NiTi spring significantly force reduction was observed after 18 h, but no significant change was showed up to 21 days. NiTi spring showed force significantly higher than synthetic elastomeric materials (p<0.05). There was no significant difference between Memory chain and Plastic chain up to 24 h. However, from 48 h to 21 days Memory chain showed force significantly higher than Plastic chain. Conclusions: There was higher force degradation in the synthetic elastomeric materials in comparison with NiTi springs, which allows the preferential indication of these space closure jigs for clinical use.


Subject(s)
Orthodontics , Tensile Strength , Biomechanical Phenomena
18.
RGO (Porto Alegre) ; 59(2): 243-249, abr.-jun. 2011. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-874580

ABSTRACT

Objetivo: Avaliar cefalometricamente a posição dos incisivos inferiores em indivíduos braquifaciais nas maloclusões de Classe I, II e III, assim como sua correlação. Métodos: A amostra constou de 60 telerradiografias de cabeça tomadas em norma lateral com imagens de qualidade e nitidez adequada, pertencentes a documentações de pacientes adultos, de ambos os sexos, portadores de dentição permanente completa e não submetidos a tratamento ortodôntico prévio. Resultados: As mensurações para análise da posição do incisivo inferior foram obtidas através das grandezas que caracterizam a posição de incisivo inferior, a saber: 1.NB, FMIA, IMPA, DC (Discrepância Cefalométrica de Tweed). Os dados foram submetidos à análise estatística de Kruskal-Wallis p<0,05 e ao Teste de correlação de Spearman considerando cada medida em função das maloclusões. Conclusão: Há correlação direta das discrepâncias esqueléticas com o posicionamento dos incisivos inferiores em indivíduos braquifaciais, e quando maior a Classe II maior a tendência de vestibularização do incisivo inferior, e quanto maior a Classe III maior a tendência de lingualização desses dentes.


Objective: The purpose of this study was to perform a cephalometric evaluation of the mandibular incisor position and its correlation with Class I, II and III malocclusions in individuals with a brachyfacial pattern. Methods: The sample consisted of 60 lateral teleradiographs of the head, with images of good quality and clarity from the documentation of adult patients of both genders, with complete permanent dentition, who had not previously been submitted to orthodontic treatment. Results: The measurements for analyzing the mandibular incisors were obtained by means of the variables that characterize the mandibular incisor position, namely: 1.NB, FMIA, IMPA, DC (Tweed?s Cephalometric Discrepancy). The data were submitted to statistical analysis using the Kruskal-Wallis test p<0,05 and Spearman?s correlation test considering each measurement as a function of the malocclusions. Conclusion: It was concluded that there is direct correlation of skeletal discrepancies with the lower incisors positioning in individuals brachyfacial, and therefore the greater the Class II greater the tendency for flaring of the lower incisor, and the higher the class III greater the tendency for these teeth lingually.


Subject(s)
Cephalometry , Growth , Incisor , Malocclusion
19.
Rev. Clín. Ortod. Dent. Press ; 9(5): 44-48, out.-nov. 2010. ilus
Article in Portuguese | LILACS, BBO | ID: lil-575372

ABSTRACT

A correção da transposição representa um grande desafio na mecânica ortodôntica. Este trabalho tem como objetivo apresentar uma alternativa de tratamento na correção da transposição entre caninos e primeiros pré-molares por meio de uso do arco segmentado, tanto em casos mais favoráveis como em casos onde o canino se encontra em completa transposição. As mecânicas apresentadas se mostraram efetivas na correção da má oclusão e não houve efeitos indesejáveis, como alterações periodontais e reabsorções radiculares ligadas ao tratamento orotodôntico.


Subject(s)
Humans , Orthodontic Appliances , Cuspid , Tooth Movement Techniques/methods
20.
Braz. j. oral sci ; 9(2): 81-84, Apr.-June 2010. ilus, tab
Article in English | LILACS, BBO | ID: lil-578069

ABSTRACT

Aim: This study evaluated the surface roughness (Ra) and the topography (scanning electron microscopy) of the dental enamel after use of different methods for removal of residual resin after debonding of orthodontic brackets. Methods: Nine roughness measurements in three directions were made on enamel surface of 60 human premolars before bracket bonding (Ra initial).Ceramic brackets were bonded with Transbond XT and stored for 24 h/37°C before debonding with pliers. The specimens were divided in five groups according to the method used for removal of residual resin: control (C); carbide bur at slow-speed (CL); carbide bur at high speed (CH); Shofu tip at low speed (SB); Shofu tip at high speed (HB); debonding pliers (ZP). Nine final surface roughness measurements (Ra final) were made and one specimen of each group was observed by SEM. The data were analyzed statistically by ANOVA, Tukey’s test and paired t test(p<.05). Results: Ra final of SB was significantly higher than C, CL, CH, and ZP groups. The test showed that the Ra final was significantly higher than Ra initial for SB and CL. Conclusions:The method used for removal of residual resin influenced the roughness of the enamel. Carbide bur at high speed presented the best results and Shofu at low speed presented the worst results.


Subject(s)
Humans , Orthodontic Brackets/adverse effects , Dental Debonding/methods , Dental Enamel/chemistry , In Vitro Techniques , Dental Polishing/methods , Dental Prophylaxis/methods , Acrylic Resins/chemistry , Analysis of Variance , Bicuspid , Microscopy, Electron, Scanning , Surface Properties
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